must_cast from NoUninit+Zeroable to array?

[James-E-A]

I've got a struct that's Copy, Clone, repr(C,packed), bytemuck::NoUninit, and bytemuck::Zeroable — but it is not bytemuck::AnyBitPattern due to being slightly value-constrained (certain fields have certain bits clamped to 0 when creating the type).

I have an array of this struct, and I need to lend this array as a [u8; _].

Is there any plan for a must_* version of the bytes_of function? I hate inviting run-time land-mines by choosing functions that panic over functions that will fail to compile when I've done something incorrect.

[zachs18]

You can use bytemuck::must_cast_ref, assuming you have the min_const_generics feature enabled, to cast from &T (including &[U; _]) to &[u8; N]

[James-E-A]

Ah, this was my bad. I was confused about the type constraints. It does indeed work.

[Lokathor]

In addition to what zachs said, casting any type that bytes_of can be called with to a slice of bytes already won't ever fail.